Reminiscences of the Vienna Circle and the Mathematical Colloquium

I The Historical Background.- II The Cultural Background.- III The Philosophical Atmosphere in Vienna.- IV Why the Circle invited me. The Theory of Curves and Dimension Theory.- V Vignettes of the Members of the Circle in 1927.- VI Reminiscences of the Wittgenstein Family.- VII Ludwig Wittgenstein's Austrian Dictionary.- VIII Wittgenstein's Tractatus and the Early Circle.- IX On the Communication of Metaphysical Ideas. Wittgenstein's Ontology.- X Wittgenstein, Brower, and the Circle.- XI Discussions in the Circle 1927-30.- XII Poland and the Vienna Circle.- XIII The United States 1930-31.- XIV Discussions in the Circle 1931-34.- XV The Circle on Ethics.- XVI Moritz Schlick's Final Years.- Memories of Kurt Gödel.- Index of Names.